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AssigneeNippon Shokubai Kagaku Kogyo Co., Ltd.
InventorsNoboru Shimizu, Hiroshi Yoshida, Hiromiki Daigo, Shiyouichi Matumoto, Hiroyoshi Uchino
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In a process for producing a 2-hydroxyalkyl acrylate or methacrylate which comprises esterifying acrylic or methacrylic acid with an alkylene oxide having 2 to 4 carbon atoms in the presence of an esterification catalyst and distilling the resulting reaction mixture in a distillation column, the improvement wherein the vapor of the ester monomer from the distillation column, while being maintained in the superheated state, is introduced into a condenser of the gas-liquid direct contact type whose inner wall corresponding to its gas inlet portion is kept at a temperature below the boiling point of the ester at the operating pressure, to contact it directly with a concurrently flowing spray liquid of the ester-precooled to a temperature below the boiling point of the ester at the operating pressure, whereby said vapor is condensed to a liquid at said temperature below the boiling point of the ester at the operating pressure.
In a process for producing 2-hydroxyalkyl acrylate or methacrylate ester monomer by esterifying acrylic acid or methacrylic acid with an alkylene oxide having 2 to 4 carbon atoms in the presence of an esterification catalyst and distilling the resulting reaction mixture in a distillation column in which the ester monomer is vaporized, and a distillation residue is formed, the improvement comprising
Dependencies are inferred from the claim text.